I didn't hang out on the non-spoiler board but I believe they were spoilers until they were confirmed by the official site. For a long time Dooku was only referred to as a charasmatic seperatist. I just think confirming this early that Boba is in the movie might be considered a spoiler by some. Of course, if Lucas did confirm then it is not a spoiler and thus this is all a moot point.

There was nothing that could really be a spoiler for EPISODE III in the 'tid-bits' unless knowing some locations that might be used for the movie is a SPOILER...As far as I am concerned if something doesnt have to be highlighted and is on the Offical Site its not a spoiler